I am testing a website in IE 11 on Windows 7. The web page lets users click a control that invokes a file picker dialog box. I can automate everything up to interacting with the file open dialog box. I have tried mapping it, typing in it but none of those actions appear to have an affect on it. I just opens, I cannot seem to type a filename into it and click Open.  Please advise.

You need to capture file path as textbox so that you can enter into file path textbox. We can sort this out in support ticket.